unable to open vchiq instance?

[IriDium]

Have you tried Mr Google and "Github xbian vchiq"?

However, that may not be your problem. It may be a memory issue and you seem to be missing memory commands.

Backup your /boot/config.txt file.
edit /boot/config.txt and change it to this.

#initramfs initramfs.gz 0x00a00000
gpu_mem_512=128
gpu_mem_256=100
initial_turbo=1
disable_splash=1
emmc_pll_core=0
arm_freq=700
core_freq=250
sdram_freq=400

Reboot and see if that makes any difference.
If not, repost dmesg and output.